Hand-held trace vapor/particle sampling system
View Patent ↗A sampling system that contains filter components for collecting and concentrating vapor and particles in high-volume flows. The sample is then vaporized and delivered to a detector at a low-volume flow. The invention also has a sampling probe that contains an air-jet to help dislodge particles from surfaces and a heating lamp to help vaporize compounds on surfaces or objects. The sampling system is especially useful for screening for explosives and other illicit chemicals and toxins on people, baggage, cargo, and other objects.
1. A concentrator that collects and transfers a sample that has a trace molecule to a detector, comprising:
a housing with at least one passage to receive the sample;
a vapor filter coupled to said housing, said vapor filter absorbs vapor from the sample;
a particle filter coupled to said housing, said particle filter collects particles from the same sample;
a controller that heats said particle filter to a temperature that also heats said vapor filter; and,
a single detector that detects a vapor/particle sample created from the vapor absorbed by said vapor filter and the particles collected by said particle filter.
2. The concentrator of claim 1 , further comprising a pump to pull the sample through said vapor and particle filters.
3. The concentrator of claim 2 , further comprising a low-volume flow source to transfer the vapor/particle sample to a detector.
4. The concentrator of claim 1 , further comprising a plurality of valves to control fluid flow about said vapor and particle filters.
5. The concentrator of claim 1 , wherein said particle filter is constructed from an electrically conductive material.
6. The concentrator of claim 1 , wherein said vapor filter is constructed from a non-electrically conductive material.
7. A method for collecting and transferring a sample with a trace molecule to a detector, comprising:
collecting at least one particle with a particle filter from the sample;
collecting a vapor with a vapor filter from the same sample;
heating the particle filter, the heating of the particle filter heats the vapor fllter to create a vapor/particle sample; and,
transferring the vapor/particle sample to a detector.
8. The method of claim 7 , wherein the particle filter is heated with a current that flows through the particle filter.
9. The method of claim 7 , wherein the particle and the vapor are collected when a first valve is open and a second valve is closed, and the vapor/particle sample is transferred when the first valve is closed and the second valve is open.